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Dosage and Calculations: Practice Problems
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A child weighs 11.2 kg and has an order for Acyclovir 120 mg IV every 8 hours. The safe does range (SDR) of Acyclovir is 25-50 mg/kg/day.
What is the SDR in mg for this child in 24 hours?
Round to nearest tenth
Weighs = 11.2 kg
120 mg = 8 hours
SDR = 25-50 mg/kg/day
Mg/day = 25mg/1 kg/day X 11.2 kg/1 =
280 mg/day
Mg/day = 50mg/1 kg/day X 11.2kg/1 =
560 mg/day
SDR = 280-560 mg/day
A child weighs 11.2 kg and has an order for Acyclovir 120 mg IV every 8 hours. The safe does range (SDR) of Acyclovir is 25-50 mg/kg/day.
What is the divided dose range in mg for this child?
Round to nearest tenth
Weighs = 11.2 kg
120 mg = 8 hours
SDR = 280-560 mg/day
1 day = 24 hours
Mg/dose = 280mg/day X day/24 hr X
8 hrs/dose = 93.3 mg/dose
Mg/dose = 560 mg/day X day/24 hrs X
8 hers/dose = 186.7 mg/dose
The pediatric nurse is caring for an infant who weighs 11.6 kg and is NPO receiving IV fluid therapy. What rate does the nurse calculate as meeting the infant's minimum hourly fluid requirement?
Weighs = 11.6kg
10 kg X 100mL = 1000mL
1.6 kg X 50mL = 80 mL
1000mL + 80 mL = 1080 mL
mL/hr = 1080 mL/1 day X 1 day/24 hrs =
45 mL/hr
Doctor's order: Augmenting oral suspension 280 mg P.O. three times a day. Available as 125mg/5mL. How many mLs will the nurse administer for one dose?
Round to nearest tenth
Dose = 280 mg
125 mg = 5 mL
mL/dose = 5 mL/125 mg X 280 mg/dose =
11.2 mL/dose
The doctor ordered Neupogen 175 mcg subcut. every 3 days. The drug label on the vial reads Neupogen 300 mcg per mL. How many mL's will the nurse administer for one dose?
Round to nearest tenth.
Dose = 175 mcg
300 mcg = 1 mL
mL/dose = 1 mL/175 mcg X 300mcg/dose =
0.6 mL/dose
The physician orders cefazolin sodium 500 mg in 50 mL 0.9% NaCl IVPB. Administer the antibiotic over 20 minutes. How many milliliters per hour will the nurse set the infusion pump?
Round to nearest whole number.
Dose = 500 mg
50 mL = 20 mins
60 min = 1 hr
mL/hr = 50 mL/20 min X 60 min/1 hr =
150 mL/hr
Ordered: Dobutamine (Dobutrex) 4 mcg/kg/min. The solution available is 500 mg in 250 mL D5W. The client weighs 82 kg. At what rate (mL per hour) will the nurse set the pump?
Round to the nearest tenth.
Dose = 4 mcg/kg/min
500 mg = 250 mL
Weighs = 82 kg
1000 mcg = 1 mg
60 mins = 1 hr
mL/hr = 250 mL/500 mg X 1 mg/ 1000mcg X
4mcg/ 1kg/min X 82 kg/1 X 60 min/1 hr =
250 X 1 X 4 X 82 X 60/ 500 X1000 =
4920000/500000 =
9.8 mL/hr
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